Alpine Electronics PSS-31GM 3-Way Sound System for 2014-Up Chevy Silverado, Set of 11 Complete 3-way sound system for 2014-Up Chevy Silverado or GMC Sierra trucks (not compatible with Crew Cab models equipped with the Bose factory system) Turns the current 2-way speaker system into a 3-way system while utilizing the factory speaker locations, all needed installation hardware like amplifier wiring and speaker mounting adapters are included 500-watt sound system is Alpine engineered to look and sound great in the compatible trucks The system consists of a 3-way speaker set for the front doors/dash, 6.5 inch coaxial speakers for the rear doors, Zero Space Subwoofer enclosure for the rear cabin wall, and a 5-channel V-Power Amplifier The PSS-31GM is an Authorized Online Product Sold and Shipped from Amazon; visit the store locator on the Alpine USA website for professional installation This is an aftermarket of generic part